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Eddi Din [679]
2 years ago
15

An element has a half-life of 30 years. If 20 mg of this element decays over a period of 90 years, how many mg of this element w

ould remain?
Biology
1 answer:
Vlada [557]2 years ago
7 0

Answer:

2.5 mg

Explanation:

<em>The half-life of a substance is the time required for one half of the substance to decay. In order words, it is the time it will take for a substance to decay into  half of its initial size.</em>

For a 20 mg element with a half-life of 30 which decays over a period of 90 years;

The first 30 years, 10 mg would have decayed, remaining 10 mg

The second 30 years, the remaining 10 mg would have decayed to 5 mg

The third 30 years, 5mg would have decayed to 2.5 mg.

Hence, in 90 years, 20 mg of the element would <u>remain only 2.5 mg.</u>

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